/Engine/Source/Runtime/Core/Public/HAL/ThreadSingleton.h
This a special version of singleton. It means that there is created only one instance for each thread. CallingGet()method is thread-safe.
template<class T> class TThreadSingleton : public [FTlsAutoCleanup](API\Runtime\Core\HAL\FTlsAutoCleanup)
const uint32
ThreadId
Thread ID of this thread singleton.